LitCharts assigns a color and icon to each theme in The Sun is Also a Star, which you can use to track the themes throughout the work.
Immigration and the American Dream
Passion vs. Reason
Interconnectedness and Destiny
Isolation vs. Connection
Summary
Analysis
Daniel writes a fake news headline about a teen accepting his destiny to become a doctor. He insists that it's his brother Charlie's fault that his summer has been so absurd. Charlie got kicked out of Harvard, and Daniel's parents, Min Soo and Dae Hyun, are extremely upset. Daniel almost feels bad for Charlie.
The headline that Daniel writes indicates that he's a writer with a flair for the dramatic, while his parents' emotional reaction to Charlie getting kicked out suggests that his family holds high standards for Charlie and probably for Daniel, too.